Keyword: feedback
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PO14 Feedback of Slow Extraction in CSRm quadrupole, extraction, synchrotron, emittance 89
 
  • J. Shi, W.P. Chai, J. Li, J.W. Xia, J.C. Yang, Y.J. Yuan
    IMP, Lanzhou, People's Republic of China
  
  The transverse tune of the beam in the synchrotron will fluctuate due to the quadrupole current ripple, which lead the spill ripple through the variation of the separatrices area. In order to reduce the ripple of the spill, a pair of fast response quadrupole (FQ) is adopted to compensate the tune ripple caused by other quadrupoles. After using the FQ feedback, the amplitude of the spill ripple within 800Hz has been reduced to 1/10 times from the normal mode. This method will be used in the HITFiL (Heavy Ion Therapy Facility in Lanzhou).  
 
TUB03 Terminal Voltage Stabilization of Pelletron Tandem Accelerator controls, ion, acceleration, electron 124
 
  • N.R. Lobanov, M.C. Blacksell, P. Linardakis, D. Tsifakis
    Research School of Physics and Engineering, Australian National University, Canberra, Australia
  
  Funding: Heavy Ion Accelerators Education Investment Fund (EIF)
A conventional corona control terminal voltage stabiliser has been investigated on the ANU 14UD tandem accelerator. The fluctuations in the charge transport of electrostatic pelletron generator and their correlation with mechanical oscillations of the chains and terminal voltage ripple have been analysed. Emphasis is placed on the performance of the two-loop feedback system and on the tuning of this system to production of high energy-resolution beams. The transfer function for the corona regulation loop has been determined and examined. The system produces the beam position at the image slit of the 90 energy-analysing magnet with long-term stability equivalent to a few hundred volts rms fluctuation of the terminal voltage. The concept of novel fast control loop utilizing the high-frequency component from the image slits to control the voltage of the last gap of high-energy acceleration tube is discussed. 		 
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